Re: [PATCH 0/6] nilfs2: remove own inode hash table

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On Tue, 24 Aug 2010 04:30:28 -0400, Christoph Hellwig wrote:
> On Tue, Aug 24, 2010 at 05:48:44PM +1000, Nick Piggin wrote:
> > The reason I broke nilfs2 is because it duplicates a lot of the
> > generic inode initialisation code. This really should go in core
> > code because nilfs2 does not own the generic inode fields.
> > 
> > It just needs some helper function to do the non-sb related init
> > stuff for you.
> 
> No, the problem is much deeper than that.  Having inodes outlive
> superblock is fundamentally broken.  All that crap simply needs
> to go away.

I agree..  I will try to resolve this problem, or will separate three
metadata files outlive superblock if I cannot find a proper way.

Actually, I recently wrote a patchset to unify all super block
instances on one device into one sb, which makes the inodes outlive
superblock eliminable.

But the patchset has a problem that it cannot shrink a number of
versions of namespace when unmounting all snapshots and a current time
instance.

If this implementation issue is avoidable, unifying per-snapshot sb
instances seems an ideal way.

Thanks,
Ryusuke Konishi
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